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That does sound high m8, not seen mine go above 65c, that said, someone playing Arma2 with the OcUK bunch the other night was on 112c on a 4850!!!
lol, yea my 4850 got to around 112c playing arma, fan speed at a constant 40%, any louder and it drives me nuts, card still works perfectly and its overclocked aswell, and it has never crashed or reverted to stock speeds while gaming at that temp 